feat: Add presence heartbeat for Matrix online status

- matrix-gateway: POST /internal/matrix/presence/online endpoint
- usePresenceHeartbeat hook with activity tracking
- Auto away after 5 min inactivity
- Offline on page close/visibility change
- Integrated in MatrixChatRoom component

node_modules/@rolldown/pluginutils/LICENSE

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+MIT License
+
+Copyright (c) 2024-present VoidZero Inc. & Contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+end of terms and conditions
+
+The licenses of externally maintained libraries from which parts of the Software is derived are listed [here](https://github.com/rolldown/rolldown/blob/main/THIRD-PARTY-LICENSE).

node_modules/@rolldown/pluginutils/package.json

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+{
+  "name": "@rolldown/pluginutils",
+  "version": "1.0.0-beta.27",
+  "license": "MIT",
+  "type": "module",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/rolldown/rolldown.git",
+    "directory": "packages/pluginutils"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "import": "./dist/index.js",
+      "require": "./dist/index.cjs"
+    }
+  },
+  "files": [
+    "dist"
+  ],
+  "devDependencies": {
+    "@types/picomatch": "^4.0.0",
+    "picomatch": "^4.0.2",
+    "tsdown": "0.12.9",
+    "vitest": "^3.0.1"
+  },
+  "scripts": {
+    "build": "tsdown",
+    "test": "vitest --typecheck"
+  }
+}